code: def test_empty_graph_subgraph_hash():
      """ "
      empty graphs should give empty dict subgraph hashes regardless of other params
      """
      G = nx.empty_graph()
  
      subgraph_hashes1 = nx.weisfeiler_lehman_subgraph_hashes(G)
      subgraph_hashes2 = nx.weisfeiler_lehman_subgraph_hashes(
          G, edge_attr="edge_attr"
      )
      subgraph_hashes3 = nx.weisfeiler_lehman_subgraph_hashes(
          G, node_attr="edge_attr"
      )
      subgraph_hashes4 = nx.weisfeiler_lehman_subgraph_hashes(
          G, iterations=2
      )
      subgraph_hashes5 = nx.weisfeiler_lehman_subgraph_hashes(
          G, digest_size=64
      )
  
      assert subgraph_hashes1 == {}
      assert subgraph_hashes2 == {}
      assert subgraph_hashes3 == {}
      assert subgraph_hashes4 == {}
      assert subgraph_hashes5 == {}
  
imports: import pytest
  import networkx
  from networkx.generators import directed
label_desc: Use image node_id 13 for calling a global function with example usage: test_empty_graph_subgraph_hash() without return types